Lambda LCS‑CC‑15 is a linear AC‑DC power supply from the TDK‑Lambda LC series, rated at 15 V output and designed for industrial control or test equipment. Common failure modes include degraded electrolytic capacitors (especially the hermetically sealed 10‑year life units), overheating of the internal regulator IC, and fan or heat sink obstruction leading to voltage sag under load. First‑check diagnostics: verify input AC voltage and polarity with a multimeter; measure output voltage at the terminals while the unit is powered and under typical load; visually inspect for bulging or leaking capacitors, burnt components, or dust buildup on the heat sink and fan. If the output is unstable or below spec, replace suspect capacitors and clean the cooling path before re‑testing.[oss-gpt-20b]